380 lines
11 KiB
HTML
380 lines
11 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8"/>
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<title>Minimal WebRTC</title>
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<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1">
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<style>
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body.justVideo {
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margin: 0;
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overflow: hidden;
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}
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body.justVideo #status, body.justVideo form {
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display: none;
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}
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#qrcodelink {
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position: sticky;
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top: 0;
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right: 0;
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float: right;
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}
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#qrcode {
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max-width: 100vw;
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max-height: 50vh;
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}
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#selfView {
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position: fixed;
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right: 0;
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bottom: 0;
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border: 5px solid blue;
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}
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#unmute, #start {
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position: fixed;
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top: 0;
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width: 100%;
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font-size: 4em;
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}
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form {
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background: lightgray;
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border: solid gold 5px;
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display: table;
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}
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form label {
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display: table-row;
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}
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#status {
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display: table;
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}
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#status .log-entry {
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display: block;
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background: lightblue;
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border: solid black 2px;
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margin: 2px;
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}
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#status .log-entry:nth-child(odd) {
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background: lightyellow;
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}
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</style>
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</head>
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<body>
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<a id="qrcodelink" style="display:none;"><img id="qrcode" /></a>
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<form name="settings">
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<label>
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Recieve remote video:
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<select name="client-video">
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<option value="none">none</option>
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<option value="true">any camera</option>
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<option value="environment" selected>rear camera</option>
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<option value="user">front camera</option>
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<option value="screen">screen share</option>
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</select>
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</label>
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<label>
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Recieve remote audio:
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<input name="client-audio" type="checkbox" value="true" />
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</label>
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<label>
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Transmit video:
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<select name="host-video">
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<option value="none" selected>none</option>
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<option value="true">any camera</option>
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<option value="environment">rear camera</option>
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<option value="user">front camera</option>
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<option value="screen">screen share</option>
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</select>
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</label>
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<label>
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Transmit audio:
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<input name="host-audio" type="checkbox" value="true" />
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</label>
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<label>
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Debug mode (show log even after starting video):
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<input name="debug" type="checkbox" value="true" />
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</label>
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</form>
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<div id="status"></div>
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<div id="videos">
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<button id="unmute" style="display:none;">Unmute</button>
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<button id="start" style="display:none;">Start Streaming</button>
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<video id="remoteView" width="100%" autoplay muted style="display:none;"></video>
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<video id="selfView" width="200" height="150" autoplay muted style="display:none;"></video>
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</div>
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<script >
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const create = (container, type) => container.appendChild(document.createElement(type));
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const body = document.querySelector("body");
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const out = document.getElementById("status");
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const qrcode = document.getElementById("qrcode");
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const qrcodelink = document.getElementById("qrcodelink");
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const remoteView = document.getElementById("remoteView");
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const selfView = document.getElementById("selfView");
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const start = document.getElementById("start");
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const unmute = document.getElementById("unmute");
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const form = document.forms["settings"];
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function _log(str, tag) {
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const logEntry = document.createElement(tag);
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logEntry.innerText = str;
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logEntry.classList.add('log-entry');
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out.appendChild(logEntry);
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}
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function log(str) {
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_log(str, 'span');
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}
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function logPre(str) {
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_log(str.split('\\r\\n').join('\r\n'), 'pre');
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}
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log("Loading...");
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unmute.addEventListener("click", _ => {
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remoteView.muted = false;
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unmute.style.display = 'none';
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});
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var settings = undefined;
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function readSettingsForm(disableForm) {
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const obj = {};
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for (const el of form.elements) {
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obj[el.name] = el.type == 'checkbox' ? el.checked : el.value;
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if (disableForm) el.disabled = true;
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}
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return obj;
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}
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for (const el of form.elements) {
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el.addEventListener("change", _ => {
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window.location.hash = JSON.stringify(readSettingsForm(false));
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});
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}
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function getRoomName() {
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JSON.parse(document.getElementById('room-name').textContent);
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}
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let roomName = window.location.hash;
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let isHost = roomName === undefined || !roomName;
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if (roomName.startsWith("#{")) {
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roomName = undefined;
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isHost = true;
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try {
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const hash = decodeURI(window.location.hash);
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log("Reading settings from hash:");
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logPre(hash);
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settings = JSON.parse(hash.substring(1));
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for (const name in settings) {
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const el = form.elements[name];
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const value = settings[name];
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if (el.type == 'checkbox') {
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el.checked = value;
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} else {
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el.value = value;
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}
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}
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} catch (error) {
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log("Failed to read settings from hash: " + error);
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}
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}
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if (isHost) {
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// From https://stackoverflow.com/a/1349426
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function makeid(length) {
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var result = '';
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var characters = 'abcdefghijklmnopqrstuvwxyz';
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var charactersLength = characters.length;
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for (var i = 0; i < length; i++) {
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result += characters.charAt(Math.floor(Math.random() * charactersLength));
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}
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return result;
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}
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roomName = makeid(8);
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qrcodelink.href = window.location.href.split('#')[0] + '#' + roomName;
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qrcode.src = window.location.href.split('#')[0] + roomName + '/qr';
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qrcodelink.style.display = '';
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} else {
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roomName = roomName.substring(1);
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qrcodelink.style.display = 'none';
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form.style.display = 'none';
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}
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log("Room: " + roomName);
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var webSocket = undefined;
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function sendJson(data) {
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const toSend = JSON.stringify(data);
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log("Sending message...");
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logPre(toSend);
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webSocket.send(toSend);
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}
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var pc = undefined;
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function createRTCPeerConnection() {
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const pc = new RTCPeerConnection();
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log("Created RTCPeerConnection.");
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pc.onicecandidate = ({candidate}) => sendJson({candidate});
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// let the "negotiationneeded" event trigger offer generation
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pc.onnegotiationneeded = async function () {
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log("In pc.onnegotiationneeded...");
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await pc.setLocalDescription(await pc.createOffer());
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sendJson({
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description: pc.localDescription
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});
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}
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pc.ontrack = ({streams: [stream]}) => {
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log("In pc.ontrack...");
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remoteView.srcObject = stream;
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log("Set srcObject");
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remoteView.play();
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if (stream.getVideoTracks().length > 0) {
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remoteView.style.display = '';
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videos.style.display = '';
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if (!settings.debug) {
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body.classList.add('justVideo');
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}
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}
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};
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return pc;
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}
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// get a local stream, show it in a self-view and add it to be sent
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async function startStreaming(fromButton) {
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const otherAudioSettings = isHost
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? settings['client-audio']
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: settings['host-audio'];
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if (otherAudioSettings) {
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unmute.style.display = '';
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}
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const videoSettings = isHost
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? settings['host-video']
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: settings['client-video'];
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log("videoSettings=" + videoSettings);
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const audioSettings = isHost
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? settings['host-audio']
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: settings['client-audio'];
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log("audioSettings=" + audioSettings);
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if (videoSettings == 'screen' && !fromButton) {
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start.style.display = '';
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return;
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}
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start.style.display = 'none';
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if (isHost) {
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sendJson({
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settings: settings
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});
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}
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if (pc !== undefined) return;
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pc = createRTCPeerConnection();
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const videoConstraints = videoSettings == 'none'
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? false
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: videoSettings == 'true'
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? true
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: { advanced: [{facingMode: videoSettings}] };
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log("Created videoConstraints.");
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if (!videoConstraints && !audioSettings) return;
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const stream = videoSettings == 'screen'
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? await navigator.mediaDevices.getDisplayMedia({
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audio: audioSettings,
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video: true
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})
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: await navigator.mediaDevices.getUserMedia({
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audio: audioSettings,
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video: videoConstraints
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});
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log("Created stream.");
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if (videoConstraints) {
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selfView.srcObject = stream;
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selfView.style.display = '';
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}
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for (const track of stream.getTracks()) {
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log("Added track.");
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pc.addTrack(track, stream);
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}
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}
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function startStreamingWithErorrHandling(fromButton) {
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startStreaming(fromButton)
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.then(() => {
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log("startStreaming() finished.");
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})
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.catch(e => {
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log("startStreaming() errored: " + e.message);
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});
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}
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start.addEventListener("click", _ => {
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startStreamingWithErorrHandling(true)
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});
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async function receiveMessage(e) {
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qrcode.style.display = 'none';
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log("In webSocket.onmessage...");
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logPre(e.data);
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const data = JSON.parse(e.data);
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if (data.requestSettings) {
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settings = readSettingsForm(true);
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startStreamingWithErorrHandling(false);
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} else if (data.settings) {
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settings = data.settings;
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startStreamingWithErorrHandling(false);
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} else if (data.description) {
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await pc.setRemoteDescription(data.description);
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if (data.description.type == "offer") {
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log("Got an offer...");
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await pc.setLocalDescription(await pc.createAnswer());
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sendJson({
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description: pc.localDescription
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});
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}
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} else if (data.candidate) {
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log("Adding ice candidate...");
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await pc.addIceCandidate(data.candidate);
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}
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};
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function createWebSocket() {
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const webSocket = new WebSocket(
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'ws' + (window.location.protocol == 'https:' ? 's' : '') + '://'
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+ window.location.host
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+ '/camera/ws/' + (isHost ? 'host' : 'client') + '/'
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+ roomName
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+ '/'
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);
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log("Created WebSocket.");
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webSocket.onclose = function(e) {
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log('WebSocket closed unexpectedly: ' + e);
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};
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webSocket.onerror = function(e) {
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log('WebSocket error: ' + e);
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};
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webSocket.onmessage = receiveMessage;
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return webSocket;
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}
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webSocket = createWebSocket();
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if (!isHost) {
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webSocket.onopen = _ => sendJson({requestSettings: true});
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}
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log("Finished <script> block.");
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</script>
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</body>
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</html>
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